STM32L051: select LSE as LPUART clock source for wakeup from stop mode?

[Rita]

Can STM32L051 set LSE be LPUART clock source to wake up the MCU? If yes, how to configure.

[KnarfB]

Yes it can for up to 9600 baud, see https://youtu.be/mKOWKQpws6M?list=PLnMKNibPkDnEv9eUjkQuJaJkmLlVlABf_&t=425

hth

KnarfB

 

[Gyessine]

Hello @Rita 
Based on your product Datasheet, yes, a 32.768 kHz clock (LSE) is needed to allow LPUART communication up to 9600baud. Therefore, even in Stop mode, the LPUART can wait for an incoming frame while having an extremely low energy consumption. 
except if you have the STM32L051K6, it does not support LPUART

to configure it, just enable your LSE in your RCC configuration

enable your LPUART

and select LSE as input for LPUART in clock configuration

this article maybe helpful for you also
Hope that answered your question, if yes please mark it as solution to close this thread
Gyessine